5) Club for Growth Action/PAC, $1.36 million, mostly in opposition to Republican House candidate Paul Gosar in Arizona and Republican Senate candidates Tommy Thompson and Eric Hovde in Wisconsin, and in support of Senate candidate Mark Neumann in Wisconsin.

7) Friends of Democracy, $776,072, in opposition to a variety of Republican congressional candidates, most notably Reps. Charlie Bass of New Hampshire, Dan Lungren of California, Sean Duffy of Wisconsin and Chip Cravaack of Minnesota.